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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Inoculation with Azospirillum brasilense (Ab-V4, Ab-V5) increases Zea mays root carboxylate-exudation rates, dependent on soil phosphorus supply

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Author(s):
D'Angioli, Andre Mouro ; Gorne Viani, Ricardo Augusto ; Lambers, Hans ; Helena Frankland Sawaya, Alexandra Christine ; Oliveira, Rafael Silva [1]
Total Authors: 5
Affiliation:
[1] Oliveira, Rafael Silva, Univ Western Australia, Sch Plant Biol, 35 Stirling Highway, Perth, WA 6009, Australia. Helena Frankland Sawaya, Alexandra Christine, D'Angioli, Andre Mouro, Univ Campinas UNICAMP, Inst Biol, Dept Plant Biol, Programa Posgrad Ecol, - Brazil
Total Affiliations: 1
Document type: Journal article
Source: PLANT AND SOIL; v. 410, n. 1-2, p. 499-507, JAN 2017.
Web of Science Citations: 6
Abstract

We aimed to investigate the effects of root carboxylate exudation in the interaction between Azospirillum brasilense and Zea mays. We hypothesized that root carboxylate exudation is a mechanism that increases colonization of the maize rhizosphere by A. brasilense and that carboxylate exudation would increase at a low soil phosphorus (P) availability. We conducted a greenhouse experiment, using maize seeds inoculated and uninoculated with A. brasiliense. Seeds were planted in pots, supplied with nutrient solution, varying in P concentration. After 45 days we measured total plant biomass, root length and area, plant nutrient status, and the root carboxylate-exudation rate. Inoculation increased the root length and area, and this effect increased with increasing P supply. Inoculated plants also showed an increased root carboxylate-exudation rate. For inoculated treatments, the exudation rate was positively correlated with root architecture parameters; however, it was negatively correlated with leaf manganese concentration, a proxy for the amount of carboxylates in the rhizosphere. Inoculation of A. brasilense stimulated root carboxylate exudation, which was positively correlated with root length and area. These positive correlations are probably mediated by the effect of carboxylates on the rhizosphere microbial community. This indicates a positive feedback in which A. brasilense inoculation stimulates root carboxylate exudation, influencing the rhizosphere microbial community. It results in positive effects on maize root architecture. The root length of inoculated plants was positively correlated with P supply, indicating that P supply positively affects the microbial community, modulating the interaction between A. brasilense and Z. mays. (AU)

FAPESP's process: 10/17204-0 - Climate change in Brazilian mountains: functional responses of native plants from campos rupestres and campos de altitude to extreme droughts
Grantee:Rafael Silva Oliveira
Support Opportunities: Regular Research Grants
FAPESP's process: 11/52072-0 - Soil-plant-atmosphere interactions in a changing tropical landscape
Grantee:Rafael Silva Oliveira
Support Opportunities: Research Grants - Research Partnership for Technological Innovation - PITE